package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.ReportMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.Builder;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.util.StringUtil;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.annotation.Resource;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @Author: lutongtong
 * @Date: 2024/10/29/16:22
 * @Description:数据统计相关接口
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Resource
    private ReportMapper reportMapper;
    @Resource
    private WorkspaceService workspaceService;

    /**
     * 统计指定时间区间内的营业额数据
     *
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO turnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)) {
            //日期计算，计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额数据，营业额是指：状态为“已完成”的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // select sum(amount) from orders where order_time > beginTime and order_time < endTime and status = 5
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = reportMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        //封装返回结果
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 统计指定时间区间内的用户数据
     *
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO userStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end之间的每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的新增用户数量 select count(id) from user where create_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();
        //存放每天的总用户数量 select count(id) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end", endTime);

            //总用户数量
            Integer totalUser = reportMapper.sumUserByMap(map);

            map.put("begin", beginTime);
            //新增用户数量
            Integer newUser = reportMapper.sumUserByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        //封装结果数据
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    /**
     * 统计指定时间区间内的订单数据
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO ordersStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end之间的每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //遍历dateList集合，查询每天的有效订单数和订单总数
        for (LocalDate date : dateList) {
            //查询每天的订单总数 select count(id) from orders where order_time > ? and order_time < ?
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            //查询每天的有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status = 5
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            //计算订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return  OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 根据条件统计订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status){
        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);

        return reportMapper.sumOrderByMap(map);
    }



    /**
     * 统计指定时间区间内的销量排名前10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSaleTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = reportMapper.getTop10(beginTime, endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        //封装返回结果数据
        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导入运营数据报表
     * @param httpServletResponse
     */
    public void exportBusinessData(HttpServletResponse httpServletResponse) {
        //查询数据库获取数据--》近三十天的数据
            //设置查询的开始时间结束时间
        LocalDate beginDate = LocalDate.now().plusDays(-30);
        LocalDate endDate = LocalDate.now().plusDays(-1);
            //处理时间，精确到时分秒
        LocalDateTime beginTime = LocalDateTime.of(beginDate, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(endDate, LocalTime.MAX);
            //根据工作台的方法查询数据
        BusinessDataVO businessData = workspaceService.getBusinessData(beginTime, endTime);
        //通过POI将查询的数据插入表格中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
        //概览数据
            //基于模板文件创建一个新的excel对象
            XSSFWorkbook excel =new XSSFWorkbook(in);
            //获取模板文件的sheet
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //获取文件的行数第二行，索引从0开始计算
            XSSFRow row = sheet.getRow(1);
            //拼接字符串将数据填充入单元格
            row.getCell(1).setCellValue("时间为" + beginDate + "-" + endDate);
            //使用上面的行对象，填充第四行数据
            row = sheet.getRow(3);
            //营业额
            row.getCell(2).setCellValue(businessData.getTurnover());
            //订单完成率
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            //新增用户数
            row.getCell(6).setCellValue(businessData.getNewUsers());
            //使用上面的行对象，填充第五行数据
            row = sheet.getRow(4);
            //有效订单
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            //平均客单价
            row.getCell(4).setCellValue(businessData.getUnitPrice());
        //明细数据
            //填充近三十天的数据，所以使用循环
            for (int i = 0 ; i < 30 ; i++){
                LocalDate date = beginDate.plusDays(i);
                LocalDateTime dateBegin = LocalDateTime.of(date, LocalTime.MIN);
                LocalDateTime dateEnd = LocalDateTime.of(date, LocalTime.MAX);
                BusinessDataVO businessDataDay = workspaceService.getBusinessData(dateBegin, dateEnd);
                row = sheet.getRow(7 + i);
                //日期
                row.getCell(1).setCellValue(date.toString());
                //营业额
                row.getCell(2).setCellValue(businessDataDay.getTurnover());
                //有效订单
                row.getCell(3).setCellValue(businessDataDay.getValidOrderCount());
                //订单完成率
                row.getCell(4).setCellValue(businessDataDay.getOrderCompletionRate());
                //平均客单价
                row.getCell(5).setCellValue(businessDataDay.getUnitPrice());
                //新增用户数
                row.getCell(6).setCellValue(businessDataDay.getNewUsers());

            }

            //通过输出流将填充完数据的表格下载到客户端浏览器中
            ServletOutputStream out = httpServletResponse.getOutputStream();
            excel.write(out);
            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }


    }
}
